Static Var Generator -A New Generation in Power Factor Correction
Jun 06,2020

Overview A New Generation in Power Factor Correction

Today's automation equipment benefits us with greater convenience as well as cost savings from higher production efficiency. However, it can also bring significant wave distortion problems to the power grid that can lead to energy loss, increasing costs and many other power quality issues.

A clean and efficient power system normally generates a sinusoidal current waveform, but the electrical equipment used on today's industrial automation industry generates non-sinusoidal currents that tend to cause many power quality problems. Voltage or current distortion, reactive power impact and unbalanced loads are common problems that lower power reliability and power efficiency and also increase operation costs.

In most cases, reactive power is the power that magnetic equipment such as transformers, motors and relays, needs to produce magnetizing flux, which is inductive. In some cases, long distance power cables and some loads generate capacitive reactive power. Both inductive and capacitive reactive power will increase the apparent power (kVA), demanding larger transformers and cable size.

Poor Power Quality can be described as any event related to the electrical network that ultimately results in a financial loss. Possible consequences of poor Power Quality include:

  1. Harmonic resonance that sabotages power distribution system stability
  2. Electrical penalty bills due to low power factor
  3. Equipment failure or malfunction due to harmonics
  4. Increase in power system losses and heat
  5. Increased investment in oversized transformers and cables
  6. Electronic communications interference
  7. Unexpected power supply failures such as breakers tripping, fuses blowing, etc.

ZDDQ SVG Power Quality Solution

ZDDQ power quality solution Static Var Generator(SVG) provides an active compensation solution based on power electronics technology.

Compared with conventional passive compensation solutions such as capacitor banks, an active compensation solution improves the reliability and quality of the power distribution system.

SVG working principle

Main benefits include:

  1. Steplessly compensate both inductive and capacitive reactive power
  2. High speed response - dynamic reactive power < 5ms
  3. Correct load imbalance - both negative and zero sequence mitigates neutral current
  4. Active compensation technology avoids harmonic resonance from the principle
  5. Extremely accurate with capability to control to unity with no fear of over correction
  6. Flexible application - modular design, embedded in standard or customised cabinet. Wall mount option
  7. Wide capacity range: 30kvar~1000kvar for a single cabinet, up to 10 cabinets in parallel
  8. Environmental adaptability: -10~50°C temperature, compatible with diesel generators
  9. Long life - MTBF > 100,000 hrs (typically 10 to 15 years)

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